Nikon Nikkor 45mm f/2.8 GN Nikkor (non-AI, pre C model)

Vignetting = B @ f/2.8
Distortion = none

Aperture Center Corner
f/2.8    C      C+
f/4      B      B-
f/5.6    B      B
f/8      B      B
f/11     A-     B+
f/16     B+     B
f/22     B-     B-
f/32     B-     C+

Notes: Moderate contrast throughout.